Improvement in apparatus for turning ovals



5 m. T. Baum".

Apparatus for Taming fivais.

No. 135,515. Patented Feb. 4,1873.

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UNITED STATES h/IYRON T. BOULT, OF BATTLE GREEK, MICHIGAN.

IMPROVEMENT I N APPARATUS FOR TURNING OVALS.

Specification forming part of Letters Patent No. 135,515, dated February4, 1873.

To all ivhom it may concern:

Be it known that I, MYRoN T. BoULT, of

Battle Creek, in the county of Calhoun and State of Michigan, haveinvented a new and useful Improvementfor the purpose of Turning Ovals,Eccentrics, and Freeing Gutters, of which the following is aspecification:

Nature and Objects of my Invention.

My invention is of the nature of a chuck or head constructed of twoprincipal parts at tached to a mandrel, so arranged that one part can bemade to revolve in an eccentric Description of Drawing.

Figure 1 is a view of apparatus. Fig. 2 is Fig. 3 is a view of a cutterwhen freed.

General Description.

A is a mandrel, held in a lathe by a center at one end and a steady-restat the other. B is a head attached tO'Sttid. mandrel having a channelplaned laterally along its face into which pieces U and O are to fitand. which are held in position by set-screws I) D, which enter throughthe slotted holes in head B.-- Slides or pieces 0 O are provided withstud E or chuck I, on and in which the work is held. The stud E isprovided with rings F F F and nut G to secure the work firmly inposition. Chuck I has aset-screw, L, for the purpose also of securingthe work in position. The stud E or chuck I, when used respectively, maybe adjusted to set and revolve in line with the center of the mandrel,by which the work may be made round, or they may be set one side of thecenter any number of degrees desiredindicated on the head B by the scalem-so that as much as necessary may be taken oil from the circle betweentwo given points, to give the amount of flatness or oval shape required.The slide G, with stud E or chuck I, can then be moved to bring the studE- or chuck I on the opposite side of the center an equal number ofdegrees, as before, by which the opposite side may be flattened like thefirst.

This apparatus is especially useful in freeing cutters, as is shown inH, Fig. 3, which shows a cutter when freed, the dotted lines showing thetrue circle as it comes from the lathe, (or when this apparatus is usedwith stud in line with the center of mandrel,) and the inside line showsthe shape of the cutter after being freed by this process. 'As much maybe taken off between the cutting-edges as is desired by setting the studover more or less, causing it to revolve in more or less of an eccentricare. A scale is provided on the head and slides for the purpose ofplacing the slides accurately in position when they are made fast by thesetscrews D D.

This apparatus may be used in the machinists common lathe, provided witha steady-rest, and the work is done by the ordinary lathe tools.

What I claim as my invention, and ask to have secured by Letters Patent,is- I The adjustable slide 0, with stud E or chuck I, (one or both,) incombination with head B, as arranged, and for the purposes set forth anddescribed in accompanying specification and drawing.

MYRON T. BOULT.

Witnesses:

FRANK W. GLAPP, O. E. LYMAN.

